Endpoint · computeGETstaging.402utils.com /v1/email-check ?email=user%40example.com
Validate an email address before you accept a signup or send to it: RFC 5322 syntax, whether the domain resolves and its MX records, whether it is a disposable/throwaway domain…
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Validate an email address before you accept a signup or send to it: RFC 5322 syntax, whether the domain resolves and its MX records, whether it is a disposable/throwaway domain (community blocklist), and whether it is a role account (info@, support@…). DNS is checked over DoH. No SMTP probing (intrusive and spammy), so a true 'domainExists' does not guarantee the mailbox exists.Overview
Grade?
UNRATED
0 of 30 paid calls toward a letter
Price
$0.003 per call
Paid calls
none yet
delivery unknown until someone pays
More info
Seller?
URL
https://staging.402utils.com/v1/email-check?email=user%40example.com
Seen
first 11 days ago · last 10 hr ago
13 free handshakes
Payment
Pays through
x402
Offered on?
Base Sepolia USDC
Listed on?
Base Sepolia
Score, from free handshakes onlyweights 2026.09.6
UN
RATED
RATED
0.200 liveness verified, no letter
To a letter · 30 paid calls
0 of 30
Held down by liveness · gap to 1.000 is 0.800: 0.297 uncertain ? + 0.503 short ? · 0.250 to D
| Component | Weight | Measured | Lower bound ? | Adds | Short ? | Uncertain ? | |
|---|---|---|---|---|---|---|---|
| livenesscosts the most it answered at all |
0.60 | 0.50 | 0.000 | 0.000 | −0.303 | −0.297 | |
| latency p95 it answered as fast as its class |
0.20 | 0.00 | 0.000 | 0.000 | −0.200 | 0 | |
| price stability the price stayed where it was listed |
0.20 | 1.00 | 1.000 | 0.200 | 0 | 0 | |
| Composite | 1.00 | 0.200 | gap to 1.000 = 0.800 · 0.503 short · 0.297 uncertain | 0.200 | −0.503 | −0.297 |
Not measured: correctness · nobody paid; honesty · nobody paid; schema conformance · no answer had a published shape to check
The multiplication, written out
0.600 × 0.000 liveness
+ 0.200 × 0.000 latency p95
+ 0.200 × 1.000 price stability
= 0.200 → UNRATED: 12 of 30 paid calls weights 2026.09.6 · 12 samples · seed cap_01M36CNNENHWRWT6F7Z0EKTB5G|2026-09-03T05:28:40.764Z|2026.09.6
Verify it yourself
npx teppi-check https://staging.402utils.com/v1/email-check?email=user%40example.comcurl -s https://api.teppi.xyz/v1/trust/cap_01M36CNNENHWRWT6F7Z0EKTB5G